Orlando started hot and aggressive, jumping out to a six-point lead early, while the Cs' offensive woes continued until Hayward hit a pair from beyond the arc.
That was a short reprieve, however, as the Magic couldn't miss, and only Horford and Mook Morris kept Boston in the game.
Coach Brad Stevens subbed in the second unit early in the hopes of generating some buckets or at least stopping the bleeding, but it wasn't until late in the half when the starters came back in that the Celtics started to get things back under control again.